• 前言
• 正文

前言

Glide通過CircleImageView來載入圖片…………是個大坑，很多人估計都遇到過這種情況：當通過Glide來在CircleImageView上載入圖片的時候，第一次顯示的是佔位圖，重新整理一次才是要載入的圖片。現在寫下這篇部落格，記錄下解決方法。

正文

public class GlideCircleImage extends BitmapTransformation {

    public GlideCircleImage(Context context) {
        super(context);
    }


    protected
 
 Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {
        return circleCrop(pool, toTransform);
    }

    private static Bitmap circleCrop(BitmapPool pool, Bitmap source) {
        if (source == null)
            return null;

        int size = Math.min(source.getWidth(), source.getHeight());
        int
 
 x = (source.getWidth() - size) / 2;
        int y = (source.getHeight() - size) / 2;

        // TODO this could be acquired from the pool too
        Bitmap squared = Bitmap.createBitmap(source, x, y, size, size);

        Bitmap result = pool.get(size, size, Bitmap.Config.ARGB_8888);
        if (result == null
 
) {
            result = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
        }

        Canvas canvas = new Canvas(result);
        Paint paint = new Paint();
        paint.setShader(new BitmapShader(squared, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
        paint.setAntiAlias(true);
        float r = size / 2f;
        canvas.drawCircle(r, r, r, paint);
        return result;
    }

    @Override
    public String getId() {
        return getClass().getName();
    }
}

相應的，用法：

GlideCircleImage circleImage = new GlideCircleImage(context);
Glide.with(context).load(xxx).transform(circleImage).placeholder(R.drawable.default_avatar).crossFade().into(avatar);